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CsFe4-δSe4: A Compound Closely Related to Alkali-Intercalated FeSe Superconductors.

Kunkun LiQing-Zhen HuangQinghua ZhangZewen XiaoToshio KamiyaHideo HosonoDuanduan YuanJiangang GuoXiaolong Chen
Published in: Inorganic chemistry (2018)
We report the synthesis and characterizations of a new FeSe-based compound CsFe4-δSe4, which is closely related to alkali intercalated FeSe superconductors while exhibits distinct features. It does not undergo phase separation and antiferromagnetic transition. Powder neutron diffractions, electron microscopy and high-angle annular-dark-field images confirm that CsFe4-δSe4 possesses an ordered Cs arrangement as √2 × √2 superstructure, evidencing a B-centered orthorhombic lattice with a space group of Bmmm. The temperature-dependent powder neutron diffractions indicate no structural and magnetic transition from 320 to 5 K. In contrast to the symmetry-breaking in FeSe, this phase naturally possesses the orthorhombic symmetry even at room temperature. DFT calculations and transport measurements reveal a novel Fermi surface geometry with two electron-like sheets centered on Γ point and intermediate density of states at the Fermi level comparing with the value of FeSe and the superconducting A xFe2Se2.
Keyphrases
  • room temperature
  • electron microscopy
  • density functional theory
  • magnetic resonance
  • molecular dynamics
  • high resolution
  • optical coherence tomography
  • molecular docking
  • molecularly imprinted
  • contrast enhanced